1 /* 2 * Texas Instruments TMP103 SMBus temperature sensor driver 3 * Copyright (C) 2014 Heiko Schocher <hs@denx.de> 4 * 5 * Based on: 6 * Texas Instruments TMP102 SMBus temperature sensor driver 7 * 8 * Copyright (C) 2010 Steven King <sfking@fdwdc.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 */ 21 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/i2c.h> 26 #include <linux/hwmon.h> 27 #include <linux/hwmon-sysfs.h> 28 #include <linux/err.h> 29 #include <linux/mutex.h> 30 #include <linux/device.h> 31 #include <linux/jiffies.h> 32 #include <linux/regmap.h> 33 34 #define TMP103_TEMP_REG 0x00 35 #define TMP103_CONF_REG 0x01 36 #define TMP103_TLOW_REG 0x02 37 #define TMP103_THIGH_REG 0x03 38 39 #define TMP103_CONF_M0 0x01 40 #define TMP103_CONF_M1 0x02 41 #define TMP103_CONF_LC 0x04 42 #define TMP103_CONF_FL 0x08 43 #define TMP103_CONF_FH 0x10 44 #define TMP103_CONF_CR0 0x20 45 #define TMP103_CONF_CR1 0x40 46 #define TMP103_CONF_ID 0x80 47 #define TMP103_CONF_SD (TMP103_CONF_M1) 48 #define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1) 49 50 #define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1) 51 #define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \ 52 TMP103_CONF_M0 | TMP103_CONF_M1) 53 54 static inline int tmp103_reg_to_mc(s8 val) 55 { 56 return val * 1000; 57 } 58 59 static inline u8 tmp103_mc_to_reg(int val) 60 { 61 return DIV_ROUND_CLOSEST(val, 1000); 62 } 63 64 static ssize_t tmp103_show_temp(struct device *dev, 65 struct device_attribute *attr, 66 char *buf) 67 { 68 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); 69 struct regmap *regmap = dev_get_drvdata(dev); 70 unsigned int regval; 71 int ret; 72 73 ret = regmap_read(regmap, sda->index, ®val); 74 if (ret < 0) 75 return ret; 76 77 return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval)); 78 } 79 80 static ssize_t tmp103_set_temp(struct device *dev, 81 struct device_attribute *attr, 82 const char *buf, size_t count) 83 { 84 struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); 85 struct regmap *regmap = dev_get_drvdata(dev); 86 long val; 87 int ret; 88 89 if (kstrtol(buf, 10, &val) < 0) 90 return -EINVAL; 91 92 val = clamp_val(val, -55000, 127000); 93 ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val)); 94 return ret ? ret : count; 95 } 96 97 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp103_show_temp, NULL , 98 TMP103_TEMP_REG); 99 100 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, tmp103_show_temp, 101 tmp103_set_temp, TMP103_TLOW_REG); 102 103 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp103_show_temp, 104 tmp103_set_temp, TMP103_THIGH_REG); 105 106 static struct attribute *tmp103_attrs[] = { 107 &sensor_dev_attr_temp1_input.dev_attr.attr, 108 &sensor_dev_attr_temp1_min.dev_attr.attr, 109 &sensor_dev_attr_temp1_max.dev_attr.attr, 110 NULL 111 }; 112 ATTRIBUTE_GROUPS(tmp103); 113 114 static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg) 115 { 116 return reg == TMP103_TEMP_REG; 117 } 118 119 static const struct regmap_config tmp103_regmap_config = { 120 .reg_bits = 8, 121 .val_bits = 8, 122 .max_register = TMP103_THIGH_REG, 123 .volatile_reg = tmp103_regmap_is_volatile, 124 }; 125 126 static int tmp103_probe(struct i2c_client *client, 127 const struct i2c_device_id *id) 128 { 129 struct device *dev = &client->dev; 130 struct device *hwmon_dev; 131 struct regmap *regmap; 132 int ret; 133 134 regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config); 135 if (IS_ERR(regmap)) { 136 dev_err(dev, "failed to allocate register map\n"); 137 return PTR_ERR(regmap); 138 } 139 140 ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK, 141 TMP103_CONFIG); 142 if (ret < 0) { 143 dev_err(&client->dev, "error writing config register\n"); 144 return ret; 145 } 146 147 i2c_set_clientdata(client, regmap); 148 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 149 regmap, tmp103_groups); 150 return PTR_ERR_OR_ZERO(hwmon_dev); 151 } 152 153 static int __maybe_unused tmp103_suspend(struct device *dev) 154 { 155 struct regmap *regmap = dev_get_drvdata(dev); 156 157 return regmap_update_bits(regmap, TMP103_CONF_REG, 158 TMP103_CONF_SD_MASK, 0); 159 } 160 161 static int __maybe_unused tmp103_resume(struct device *dev) 162 { 163 struct regmap *regmap = dev_get_drvdata(dev); 164 165 return regmap_update_bits(regmap, TMP103_CONF_REG, 166 TMP103_CONF_SD_MASK, TMP103_CONF_SD); 167 } 168 169 static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume); 170 171 static const struct i2c_device_id tmp103_id[] = { 172 { "tmp103", 0 }, 173 { } 174 }; 175 MODULE_DEVICE_TABLE(i2c, tmp103_id); 176 177 static const struct of_device_id tmp103_of_match[] = { 178 { .compatible = "ti,tmp103" }, 179 { }, 180 }; 181 MODULE_DEVICE_TABLE(of, tmp103_of_match); 182 183 static struct i2c_driver tmp103_driver = { 184 .driver = { 185 .name = "tmp103", 186 .of_match_table = of_match_ptr(tmp103_of_match), 187 .pm = &tmp103_dev_pm_ops, 188 }, 189 .probe = tmp103_probe, 190 .id_table = tmp103_id, 191 }; 192 193 module_i2c_driver(tmp103_driver); 194 195 MODULE_AUTHOR("Heiko Schocher <hs@denx.de>"); 196 MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver"); 197 MODULE_LICENSE("GPL"); 198